I'm glad you like it. Scetchup can be pretty addicting once you get a handle on it. You should try it if you haven't already, its pretty easy. Love your drawings btw. That particular Drury Plaza provided by Sketchup is measured at 346 ft tall to the tip of the antenna. My building would be less than 2 1/2 times that size. It may have been the angle of the photo that made it look not to scale, so here's another.
focOneRepublicCenter15 by
Fireoutofclay, on Flickr
As far as Hemisfair Park, I started making a series of 5 additional themed towers of varying heights within the park. Each tower is supposed to represent a "flag" over Texas. The largest reaches 1836ft; I call it "The Heart of Texas". But even for a fantasy rendering it was getting kind of ridiculous. And since Hemisfair is actually being redeveloped in real life, I see no need to "compete" with reality. I am working on a pavilion going over Market Street that could complement the current master plan. But hey, if you have some ideas that you wouldn't mind sharing, I wouldn't mind taking to time to create something for you using your ideas.